Adjusting filter coefficients

Details Adjusting filter coefficients Adjusting filter coefficients

1991-01-29

1992-06-09

Chin, Stephen

Pulse or digital communications

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375 14, 36472801, H04B 110

Patent

active

051214156

ABSTRACT:
In an adaptive filter (56) the coefficients of a transversal filter (64) are adjusted by a processing circuit (78) to reduce the difference between a signal applied to the filter input (55) and a reference signal applied to a further input (57) so that the filter transfer characteristic becomes such that it will convert a first signal into a second signal. The first and second signals are constituted by a signal occurring in a signal path through a communications receiver and an ideal version of this signal respectively. In order that a relatively simple but hence relatively slow algorithm can be employed by the processing circuit without requiring a correspondingly long first signal the first and second signals are not applied to the adaptive filter directly but only after convolution in respective transversal filters (49,62) with the output of a noise source (60). The adaptive filter is then used as an equalizer in the receiver.

REFERENCES:
patent: 4262360 (1981-04-01), Bigio et al.
patent: 4320517 (1982-03-01), Godard et al.
patent: 4334313 (1982-06-01), Gitlin et al.
patent: 4376308 (1983-03-01), McNair
patent: 4386430 (1983-05-01), Treiber
patent: 4550415 (1985-10-01), Debus, Jr.
patent: 4577732 (1986-02-01), Pirani et al.
patent: 4580275 (1986-04-01), Pirani et al.
patent: 4718073 (1988-01-01), Takaoka

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